How to read surface tension?

January 25, 2006, 09:59

Hi,

Is it possible to read from the UDF the value of the surface tension coefficient given through Define > Phases > Interaction > Surface Tension ?

Thanks.

January 25, 2006, 10:37

I don't know if I understood right, but if you mean giving a non-constant value to the surface tension coefficient (for example, as a function of temperature) by UDF the answer is yes (DEFINE_PROPERTY macro, there might be an example even in the udf manual).

Hope this helps

Edi.

January 25, 2006, 11:37

Thanks, but I need not to give value from UDF to the solver, but to read the current value of the surace tension into UDF.

January 25, 2006, 13:02

Ok, sorry for the misunderstanding. I think you can use the RP_get_real macro, but you have to know the Scheme name of that variable, and unfortunately I don't...

Hope someone will be more helpful...

Edi.

January 26, 2006, 09:55

My case file contains:

(sfc-tension-coeff (phase-2 phase-1 (constant . 0.036)))

But I do not know how to read this value (0.036) with RP_Get_Real...

January 25, 2006, 09:59	How to read surface tension?	#1
_svl Guest Posts: n/a	Hi, Is it possible to read from the UDF the value of the surface tension coefficient given through Define > Phases > Interaction > Surface Tension ? Thanks.

January 25, 2006, 10:37	Re: How to read surface tension?	#2
edi Guest Posts: n/a	I don't know if I understood right, but if you mean giving a non-constant value to the surface tension coefficient (for example, as a function of temperature) by UDF the answer is yes (DEFINE_PROPERTY macro, there might be an example even in the udf manual). Hope this helps Edi.

January 25, 2006, 11:37	Re: How to read surface tension?	#3
_svl Guest Posts: n/a	Thanks, but I need not to give value from UDF to the solver, but to read the current value of the surace tension into UDF.

January 25, 2006, 13:02	Re: How to read surface tension?	#4
edi Guest Posts: n/a	Ok, sorry for the misunderstanding. I think you can use the RP_get_real macro, but you have to know the Scheme name of that variable, and unfortunately I don't... Hope someone will be more helpful... Edi.

January 26, 2006, 09:55	Re: How to read surface tension?	#5
_svl Guest Posts: n/a	My case file contains: (sfc-tension-coeff (phase-2 phase-1 (constant . 0.036))) But I do not know how to read this value (0.036) with RP_Get_Real...

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